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Down-conversion luminescent material with broad band absorption and preparation method thereof

A luminescent material and wide-band technology, which is applied in the field of down-conversion luminescent material with broad-band absorption and its preparation, can solve the problems of insignificant improvement in energy conversion efficiency, weak near-infrared light emission intensity, and low absorption capacity. Achieve the effect of low cost, stable properties and easy operation

Inactive Publication Date: 2018-05-04
INST OF RESOURCES UTILIZATION & RARE EARTH DEV GUANGDONG ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, more researches on photoconversion materials mainly focus on M 3+ -Yb 3+ (M 3+ =Tb 3+ , Tm 3+ , Eu 3+ and Pr 3+ ) doped luminescent material, due to the trivalent rare earth M 3+ (M 3+ =Tb 3+ , Tm 3+ , Eu 3+ and Pr 3+ )’s 4f-4f transition is a parity-forbidden electric dipole transition with a small absorption cross-section and low absorption in the violet-blue region, which leads to Yb in these materials 3+ The near-infrared light emission intensity of ions is weak, and the improvement of energy conversion efficiency is not obvious

Method used

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  • Down-conversion luminescent material with broad band absorption and preparation method thereof
  • Down-conversion luminescent material with broad band absorption and preparation method thereof
  • Down-conversion luminescent material with broad band absorption and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Weigh 2.7210g of boric acid, 1.6314g of gadolinium oxide, 1.5294g of aluminum oxide, 0.0985g of ytterbium oxide and 0.0861g of cerium oxide, grind them evenly in an agate mortar, put them into a corundum crucible, put them into a high-temperature furnace, and Keep warm at 600°C for 1 hour, take it out after cooling to room temperature, and grind it evenly, then put the mixture into a corundum crucible, then put it into a crucible with activated carbon and cover it tightly, put it into a box furnace for sintering at 1250°C for 6 Hours, sintered and pulverized into powder, washed with deionized water, passed through a 400-mesh sieve, separated from water and powder, and dried at 180°C to obtain Gd 0.9 al 3.0 (BO 3 ) 4 :0.05Ce 3+ ,0.05Yb 3+ Down-converting luminescent material. The XRD pattern of the down-converting luminescent material is shown in figure 1 , and the excitation and near-infrared emission spectra at room temperature are shown in figure 2 .

Embodiment 2

[0025] Weigh 3.2157g of boric acid, 1.5294g of alumina, 1.8719g of ytterbium oxide and 0.0861g of cerium oxide, grind them evenly in an agate mortar, put them into a corundum crucible, put them into a high-temperature furnace, and keep them warm at 800°C for 2 hours , after cooling to room temperature, take it out and grind it evenly, and then put the mixture at 1250℃, the volume ratio is 75%N 2 :25%H 2 Sintered in an atmosphere of 10 hours, crushed into powder after sintering, washed with deionized water, passed through a 400-mesh sieve, separated from water and powder, and dried at 200 ° C to obtain Al 3.0 (BO 3 ) 4 :0.05Ce 3+ ,0.95Yb 3+ Down-converting luminescent material.

Embodiment 3

[0027]Weigh 2.7210g of boric acid, 1.0513g of gadolinium oxide, 1.4058g of gallium oxide, 0.7647g of aluminum oxide, 0.7882g of ytterbium oxide and 0.0344g of cerium oxide, grind them evenly in an agate mortar, put them into a corundum crucible, and put In the furnace, heat it at 600°C for 1 hour, take it out after cooling to room temperature and grind it evenly, and then put the mixture at 1200°C with a volume ratio of 75%N 2 :25%H 2 Sintered under the atmosphere of 6 hours, crushed into powder after sintering, washed with deionized water, passed through a 400-mesh sieve, separated from water and powder, and dried at 150°C to obtain Gd 0.58 Al 1.5 Ga 1.5 (BO 3 ) 4 :0.02Ce 3+ ,0.40Yb 3+ Down-converting luminescent material.

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Abstract

The invention discloses a down-conversion luminescent material with broad band absorption. The luminescent material has a chemical general formula of M1-x-y-zM'zA3(BO3)4:xCe<3+>, yYb<3+>, wherein M isat least one of Y or Gd; M' is one of Lu, La, Sc and Bi; A is at least one of Al and Ga; x is more than 0 and less than or equal to 0.3; y is more than 0 and less than 1; z is more than or equal to 0and less than 1. The preparation method of the luminescent material comprises the following steps: weighing oxides of Lu, La, Y, Gd, Al, Ga, Sc, Bi, Ce and Yb and boric acid according to a stoichiometric ratio of the chemical general formula; uniformly mixing, sintering at a temperature of 600-800 DEG C, cooling to a room temperature, taking out the mixture, grinding, and sintering at a temperature of 1100-1250 DEG C in a reducing atmosphere; grinding into powder after sintering, washing with deionized water, passing through a 400-mesh sieve, performing water-powder separation, and drying, thereby obtaining the down-conversion luminescent material with broad band absorption. The down-conversion luminescent material disclosed by the invention has strong near infrared emission and is matched with the most sensitive response band of a silicon solar cell. Moreover, the down-conversion luminescent material disclosed by the invention is stable in property, and the manufacturing method is simple, easy to operate and low in cost.

Description

technical field [0001] The invention belongs to the technical field of luminescent materials and their preparation, and in particular relates to a down-conversion luminescent material with broadband absorption and a preparation method thereof. technical background [0002] Facing the current gradual depletion of fossil energy and the destructive impact of the consumption of fossil energy on the ecological environment, it is urgent to develop and utilize new energy or renewable energy. Solar energy has the advantages of being renewable and non-polluting, and is a very competitive green new energy. Silicon solar cells are devices that convert sunlight energy into electricity. Sunlight is a continuous spectrum with a wide distribution. The wavelength range of solar radiation observed on the ground is about 300~2500nm, while the effective response band range of silicon solar cells to incident light is 400~1100nm, which is similar to the spectral distribution of sunlight. Incom...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/80
CPCC09K11/778
Inventor 张秋红倪海勇张芳腾丁建红李许波唐巍
Owner INST OF RESOURCES UTILIZATION & RARE EARTH DEV GUANGDONG ACAD OF SCI
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